Phenotypic variation in both morphology and symmetry of individuals may appear due to environmental stress caused by land-use changes. Here, we evaluated fluctuating asymmetry (FA) and wing size variations of two orchid bee species, Euglossa ignita Smith, 1874 and Eulaema meriana (Olivier, 1789), comparing 11 wing traits. We sampled the individuals from legal reserves (LR), areas of permanent protection (APP), and oil palm plantations (PALM) in Eastern Amazonia. We calculated FA as the absolute difference between the wing measurements made in the right and left wings of specimens and both species’ wing size. We corrected each FA measure for possible directional asymmetry bias by subtracting the mean value of the mean FA signed difference to each FA measure. We compared FA and the size of each wing trait of each species between land-use types using one-way ANOVAs. We found no effect of FA between land-use types, but we observed individuals of both species from PALM areas having larger wings than those from LR areas. Our results demonstrate that there seems to be a pressure exerted by land-use change associated with palm oil cultivation favoring individuals with larger wings, although both species had shown substantial permeability of oil palm.

由于土地利用变化引起的环境压力，个体的形态和对称性的表型变异可能出现。在这里，我们评估了两种兰花蜜蜂物种Euglossa ignita Smith, 1874 和Eulaema meriana 的波动不对称性 (FA) 和翅膀大小变化(Olivier, 1789)，比较了 11 种翅膀特征。我们从亚马逊东部的法定保护区 (LR)、永久保护区 (APP) 和油棕种植园 (PALM) 对个体进行抽样。我们将 FA 计算为在标本的右翼和左翼中进行的翼测量与两个物种的翼尺寸之间的绝对差异。我们通过减去每个 FA 测量的平均 FA 符号差异的平均值来纠正每个 FA 测量可能的方向不对称偏差。我们使用单向方差分析比较了土地利用类型之间每个物种的 FA 和每个翅膀特征的大小。我们发现 FA 在土地利用类型之间没有影响，但我们观察到来自 PALM 地区的两种物种的个体比来自 LR 地区的个体具有更大的翅膀。